restore windows x86_64 3.8 Python job (#765)

* mistakenly partially removed in a previous PR

Author: nitzmahone

.github/workflows/ci.yaml

@@ -354,6 +354,9 @@ jobs:
     strategy:
       matrix:
         include:
+#        - platform: windows-2019
+#          build_arch: x64
+#          python_arch: x64
 #          spec: 3.8
 #        - platform: windows-2019
 #          build_arch: x64

.github/workflows/manual_artifact_build.yaml

@@ -352,6 +352,9 @@ jobs:
     strategy:
       matrix:
         include:
+        - platform: windows-2019
+          build_arch: x64
+          python_arch: x64
           spec: 3.8
         - platform: windows-2019
           build_arch: x64